Quarterly report pursuant to Section 13 or 15(d)

Convertible Preferred Stock (Stock Repurchase) (Detail)

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Convertible Preferred Stock (Stock Repurchase) (Detail) (USD $)
6 Months Ended
Jun. 24, 2012
Dec. 25, 2011
Preferred Stock [Line Items]    
Number of Shares 9,017,217 10,657,252
Original Issusance $ 27,688  
Liquidation Preference 13,714 15,799
Series A Convertible Preferred Stock [Member]
   
Preferred Stock [Line Items]    
Number of Shares 7,667,768  
Date of Issuance November 2006  
Original Issusance 21,152  
Liquidation Preference 7,725  
Series B Convertible Preferred Stock [Member]
   
Preferred Stock [Line Items]    
Number of Shares 834,934  
Date of Issuance November 2006  
Original Issusance 2,303  
Liquidation Preference 841  
Series X Convertible Preferred Stock [Member]
   
Preferred Stock [Line Items]    
Number of Shares 514,515  
Date of Issuance May 2010  
Original Issusance 4,233  
Liquidation Preference $ 5,148